// VERSION: 2.2 LAST UPDATE: 13.03.2012
/* 
 * Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
 * 
 * Made by Wilq32, wilq32@gmail.com, Wroclaw, Poland, 01.2009
 * Website: http://code.google.com/p/jqueryrotate/ 
 */

// Documentation removed from script file (was kinda useless and outdated)
(function ($) {
	var supportedCSS, styles = document.getElementsByTagName("head")[0].style, toCheck = "transformProperty WebkitTransform OTransform msTransform MozTransform".split(" ");
	for (var a = 0; a < toCheck.length; a++) if (styles[toCheck[a]] !== undefined) supportedCSS = toCheck[a];
	// Bad eval to preven google closure to remove it from code o_O
	// After compresion replace it back to var IE = 'v' == '\v'
	var IE = eval('"v"=="\v"');

	jQuery.fn.extend({
		rotate: function (parameters) {
			if (this.length === 0 || typeof parameters == "undefined") return;
			if (typeof parameters == "number") parameters = { angle: parameters };
			var returned = [];
			for (var i = 0, i0 = this.length; i < i0; i++) {
				var element = this.get(i);
				if (!element.Wilq32 || !element.Wilq32.PhotoEffect) {

					var paramClone = $.extend(true, {}, parameters);
					var newRotObject = new Wilq32.PhotoEffect(element, paramClone)._rootObj;

					returned.push($(newRotObject));
				}
				else {
					element.Wilq32.PhotoEffect._handleRotation(parameters);
				}
			}
			return returned;
		},
		getRotateAngle: function () {
			var ret = [];
			for (var i = 0, i0 = this.length; i < i0; i++) {
				var element = this.get(i);
				if (element.Wilq32 && element.Wilq32.PhotoEffect) {
					ret[i] = element.Wilq32.PhotoEffect._angle;
				}
			}
			return ret;
		},
		stopRotate: function () {
			for (var i = 0, i0 = this.length; i < i0; i++) {
				var element = this.get(i);
				if (element.Wilq32 && element.Wilq32.PhotoEffect) {
					clearTimeout(element.Wilq32.PhotoEffect._timer);
				}
			}
		}
	});

	// Library agnostic interface
	Wilq32 = window.Wilq32 || {};
	Wilq32.PhotoEffect = (function () {

		if (supportedCSS) {
			return function (img, parameters) {
				img.Wilq32 = {
					PhotoEffect: this
				};

				this._img = this._rootObj = this._eventObj = img;
				this._handleRotation(parameters);
			}
		} else {
			return function (img, parameters) {
				// Make sure that class and id are also copied - just in case you would like to refeer to an newly created object
				this._img = img;

				this._rootObj = document.createElement('span');
				this._rootObj.style.display = "inline-block";
				this._rootObj.Wilq32 =
					{
						PhotoEffect: this
					};
				img.parentNode.insertBefore(this._rootObj, img);

				if (img.complete) {
					this._Loader(parameters);
				} else {
					var self = this;
					// TODO: Remove jQuery dependency
					jQuery(this._img).bind("load", function () {
						self._Loader(parameters);
					});
				}
			}
		}
	})();

	Wilq32.PhotoEffect.prototype = {
		_setupParameters: function (parameters) {
			this._parameters = this._parameters || {};
			if (typeof this._angle !== "number") this._angle = 0;
			if (typeof parameters.angle === "number") this._angle = parameters.angle;
			this._parameters.animateTo = (typeof parameters.animateTo === "number") ? (parameters.animateTo) : (this._angle);

			this._parameters.step = parameters.step || this._parameters.step || null;
			this._parameters.easing = parameters.easing || this._parameters.easing || function (x, t, b, c, d) { return -c * ((t = t / d - 1) * t * t * t - 1) + b; }
			this._parameters.duration = parameters.duration || this._parameters.duration || 1000;
			this._parameters.callback = parameters.callback || this._parameters.callback || function () { };
			if (parameters.bind && parameters.bind != this._parameters.bind) this._BindEvents(parameters.bind);
		},
		_handleRotation: function (parameters) {
			this._setupParameters(parameters);
			if (this._angle == this._parameters.animateTo) {
				this._rotate(this._angle);
			}
			else {
				this._animateStart();
			}
		},

		_BindEvents: function (events) {
			if (events && this._eventObj) {
				// Unbinding previous Events
				if (this._parameters.bind) {
					var oldEvents = this._parameters.bind;
					for (var a in oldEvents) if (oldEvents.hasOwnProperty(a))
						// TODO: Remove jQuery dependency
						jQuery(this._eventObj).unbind(a, oldEvents[a]);
				}

				this._parameters.bind = events;
				for (var a in events) if (events.hasOwnProperty(a))
					// TODO: Remove jQuery dependency
					jQuery(this._eventObj).bind(a, events[a]);
			}
		},

		_Loader: (function () {
			if (IE)
				return function (parameters) {
					var width = this._img.width;
					var height = this._img.height;
					this._img.parentNode.removeChild(this._img);

					this._vimage = this.createVMLNode('image');
					this._vimage.src = this._img.src;
					this._vimage.style.height = height + "px";
					this._vimage.style.width = width + "px";
					this._vimage.style.position = "absolute"; // FIXES IE PROBLEM - its only rendered if its on absolute position!
					this._vimage.style.top = "0px";
					this._vimage.style.left = "0px";

					/* Group minifying a small 1px precision problem when rotating object */
					this._container = this.createVMLNode('group');
					this._container.style.width = width;
					this._container.style.height = height;
					this._container.style.position = "absolute";
					this._container.setAttribute('coordsize', width - 1 + ',' + (height - 1)); // This -1, -1 trying to fix ugly problem with small displacement on IE
					this._container.appendChild(this._vimage);

					this._rootObj.appendChild(this._container);
					this._rootObj.style.position = "relative"; // FIXES IE PROBLEM
					this._rootObj.style.width = width + "px";
					this._rootObj.style.height = height + "px";
					this._rootObj.setAttribute('id', this._img.getAttribute('id'));
					this._rootObj.className = this._img.className;
					this._eventObj = this._rootObj;
					this._handleRotation(parameters);
				}
			else
				return function (parameters) {
					this._rootObj.setAttribute('id', this._img.getAttribute('id'));
					this._rootObj.className = this._img.className;

					this._width = this._img.width;
					this._height = this._img.height;
					this._widthHalf = this._width / 2; // used for optimisation
					this._heightHalf = this._height / 2;// used for optimisation

					var _widthMax = Math.sqrt((this._height) * (this._height) + (this._width) * (this._width));

					this._widthAdd = _widthMax - this._width;
					this._heightAdd = _widthMax - this._height;	// widthMax because maxWidth=maxHeight
					this._widthAddHalf = this._widthAdd / 2; // used for optimisation
					this._heightAddHalf = this._heightAdd / 2;// used for optimisation

					this._img.parentNode.removeChild(this._img);

					this._aspectW = ((parseInt(this._img.style.width, 10)) || this._width) / this._img.width;
					this._aspectH = ((parseInt(this._img.style.height, 10)) || this._height) / this._img.height;

					this._canvas = document.createElement('canvas');
					this._canvas.setAttribute('width', this._width);
					this._canvas.style.position = "relative";
					this._canvas.style.left = -this._widthAddHalf + "px";
					this._canvas.style.top = -this._heightAddHalf + "px";
					this._canvas.Wilq32 = this._rootObj.Wilq32;

					this._rootObj.appendChild(this._canvas);
					this._rootObj.style.width = this._width + "px";
					this._rootObj.style.height = this._height + "px";
					this._eventObj = this._canvas;

					this._cnv = this._canvas.getContext('2d');
					this._handleRotation(parameters);
				}
		})(),

		_animateStart: function () {
			if (this._timer) {
				clearTimeout(this._timer);
			}
			this._animateStartTime = +new Date;
			this._animateStartAngle = this._angle;
			this._animate();
		},
		_animate: function () {
			var actualTime = +new Date;
			var checkEnd = actualTime - this._animateStartTime > this._parameters.duration;

			// TODO: Bug for animatedGif for static rotation ? (to test)
			if (checkEnd && !this._parameters.animatedGif) {
				clearTimeout(this._timer);
			}
			else {
				if (this._canvas || this._vimage || this._img) {
					var angle = this._parameters.easing(0, actualTime - this._animateStartTime, this._animateStartAngle, this._parameters.animateTo - this._animateStartAngle, this._parameters.duration);
					this._rotate((~~(angle * 10)) / 10);
				}
				if (this._parameters.step) {
					this._parameters.step(this._angle);
				}
				var self = this;
				this._timer = setTimeout(function () {
					self._animate.call(self);
				}, 10);
			}

			// To fix Bug that prevents using recursive function in callback I moved this function to back
			if (this._parameters.callback && checkEnd) {
				this._angle = this._parameters.animateTo;
				this._rotate(this._angle);
				this._parameters.callback.call(this._rootObj);
			}
		},

		_rotate: (function () {
			var rad = Math.PI / 180;
			if (IE)
				return function (angle) {
					this._angle = angle;
					this._container.style.rotation = (angle % 360) + "deg";
				}
			else if (supportedCSS)
				return function (angle) {
					this._angle = angle;
					this._img.style[supportedCSS] = "rotate(" + (angle % 360) + "deg)";
				}
			else
				return function (angle) {
					this._angle = angle;
					angle = (angle % 360) * rad;
					// clear canvas	
					this._canvas.width = this._width + this._widthAdd;
					this._canvas.height = this._height + this._heightAdd;

					// REMEMBER: all drawings are read from backwards.. so first function is translate, then rotate, then translate, translate..
					this._cnv.translate(this._widthAddHalf, this._heightAddHalf);	// at least center image on screen
					this._cnv.translate(this._widthHalf, this._heightHalf);			// we move image back to its orginal 
					this._cnv.rotate(angle);										// rotate image
					this._cnv.translate(-this._widthHalf, -this._heightHalf);		// move image to its center, so we can rotate around its center
					this._cnv.scale(this._aspectW, this._aspectH); // SCALE - if needed ;)
					this._cnv.drawImage(this._img, 0, 0);							// First - we draw image
				}

		})()
	}

	if (IE) {
		Wilq32.PhotoEffect.prototype.createVMLNode = (function () {
			document.createStyleSheet().addRule(".rvml", "behavior:url(#default#VML)");
			try {
				!document.namespaces.rvml && document.namespaces.add("rvml", "urn:schemas-microsoft-com:vml");
				return function (tagName) {
					return document.createElement('<rvml:' + tagName + ' class="rvml">');
				};
			} catch (e) {
				return function (tagName) {
					return document.createElement('<' + tagName + ' xmlns="urn:schemas-microsoft.com:vml" class="rvml">');
				};
			}
		})();
	}

})(jQuery);
